thelawin.dev E-Invoicing API

thelawin.dev is a developer-first API for generating EU-compliant e-invoices from clean JSON. It returns valid PDF/A-3 invoices with embedded XML for ZUGFeRD 2.4, Factur-X 1.0.8 and XRechnung 3.0.2, plus XML-only formats like UBL, CII, Peppol and FatturaPA. It is built for SaaS products, ERP tools, billing workflows and AI agents that need invoicing without handling PDF/A, EN 16931 or country-specific e-invoicing details themselves. The API is stateless by design: invoice data is processed into a response and not stored. Use it via REST, SDKs or the MCP endpoint for agent workflows.